Node-RED nodes for publishing data to and subscribing to data from PrismTech Vortex
npm install -g node-red node-red-contrib-vortexnode-redOpen your browser to localhost:1880/#
There are three types of nodes
- a config node;
- Vortex In an input node; and
- Vortex Out an output node.
PrismTech Vortex input node. Outputs an object called msg containing msg.payload which is a JSON object.
| Property | Required | Description |
|---|---|---|
| Vortex | Yes | Reference to the prismtech-vortex config node that you are connecting to. |
| Topic | Yes | The topic that you are interested in. The format of the topic is [/]?. The partition part of the topic is optional. If the partition is being specified then the topic name is whatever is after the last '/'. A partition on an in node can use * to represent a wildcard. |
| Name | No | A user-friendly label that will be used for the node in the flow. If no name is provided then the topic is used. |
| Domain | No | The domain that you are interested in. It is an integer value. |
| Reliability | No | Reliable the service will attempt to deliver all samples in its history. Best Effort it is acceptable that the service not retry sending samples. |
| History | No | Keep last implies that you are only interested in keeping the latest values of an instance and older ones are discarded. Keep all implies that you are interested in keeping and getting all the values of an instance. |
| Depth | No | The number of samples per instance to keep when using keep last history. |
| Content filter | No | It is a way to provide a content-based subscription. It indicates that you do not want to receive all instances or values of the Topic, but rather a subset of them that satisfy some criteria, expressed in JavaScript. |
| Time filter | No | Indicates that you want receive at most one sample every milliseconds period per instance. |
PrismTech Vortex output node. Input is an object called msg containing msg.payload which is a JSON object to be written to Vortex.
| Property | Required | Description |
|---|---|---|
| Vortex | Yes | Reference to the prismtech-vortex config node that you are connecting to. |
| Topic | Yes | The topic that you are interested in. The format of the topic is [/]?. The partition part of the topic is optional. If the partition is being specified then the topic name is whatever is after the last '/'. A partition on an in node can use * to represent a wildcard. |
| Name | No | A user-friendly label that will be used for the node in the flow. If no name is provided then the topic is used. |
| Domain | No | The domain that you are interested in. It is an integer value. |
| Reliability | No | Reliable the service will attempt to deliver all samples in its history. Best Effort it is acceptable that the service not retry sending samples. |
| History | No | Keep last implies that you are only interested in keeping the latest values of an instance and older ones are discarded. Keep all implies that you are interested in keeping and getting all the values of an instance. |
| Depth | No | The number of samples per instance to keep when using keep last history. |
// Get the latitude and longitude from the Vortex data
var lat1 = msg.payload.d.lat;
var lon1 = msg.payload.d.lng;
// Big Ben in the UK
var lat2 = 51.5007733;
var lon2 = -0.1246402;
var radlat1 = Math.PI * lat1/180
var radlat2 = Math.PI * lat2/180
var radlon1 = Math.PI * lon1/180
var radlon2 = Math.PI * lon2/180
var theta = lon1-lon2
var radtheta = Math.PI * theta/180
var dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
dist = Math.acos(dist)
dist = dist * 180/Math.PI
dist = dist * 60 * 1.1515
var newMsg = { "payload": {"dist": dist }};
node.send(newMsg);PrismTech’s Vortex Intelligent Data Sharing Platform provides the leading implementations of the Object Management Group’s Data Distribution Service (DDS) for Real-time Systems standard. DDS is a middleware protocol and API standard for data-centric connectivity and is the only standard able to meet the advanced requirements of the Internet of Things (IoT). DDS provides the low-latency data connectivity, extreme reliability and scalability that business and mission-critical IoT applications need. For more information visit www.prismtech.com/vortex .
This is a proof of concept/prototype/alpha and is therefore provided as is with no formal support. If you experience an issue or have a question we'll do our best to answer it. In order to help us improve our innovations we would like your feedback and suggestions. Please submit an issue and/or provide suggestions via the GitHub issue tracker or by emailing [email protected].
All use of this source code is subject to the Apache License, Version 2.0. http://www.apache.org/licenses/LICENSE-2.0
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